Twisting devices for filaments, especially for textile filaments

ABSTRACT

The device has several rotary rings against which the filament must be applied so as to be driven in rotation by the inner edge of the said rotary rings to undergo twisting. These rotary rings, being staggered along a rectilinear path and distributed in two groups, which overlap so that in following the rectilinear path there is encountered alternately a ring of one group and a ring of the other group. These two groups can undergo relative displacement in a plane perpendicular to the rectilinear path. The rings of the two groups are urged against a single drive roller driving the said rings, and the relative displacement of the two groups is effected by pivoting around the axis of this single drive roller.

United States Patent 1191 Batsch 1111 3,811,258 [451 May21, 1974 154 TWISTING DEVICES F011 ESPECIALLY FOR TEXTILE FILAMENTS [75] inventor: Guy Batsch, Aubenas, France [73] Assignee: Societe Civile Textile dite Socitex,

. Lyon, France 221 Filed: Sep t.24, 1971 [21] Appl. No.1 183,503

[52] US. Cl 57/34 HS, 57/77.4, 57/77.45 i511 Int. Cl. D02g 1/04, DOlh 7/92 58 Field ofsearchi 57/34 HS, 77.3, 77.33,

[56] References Cited UNITED STATES PATENTS 6/1960 Dobs on 57/77.4 X 2/1962 Findlow 57/77.4 6/1962 Gilchrist et al. 57/34 HS X 4/1972 Gilchrist .1 57/77.4 X

Primary Examiner-lohn W. l-lucker't Assistant Examiner-Charles Gorenstein Attorney, Agent, or Firm-Michael S. Striker 57 ABSTRACT- The device has several rotary rings against which the filament must be applied so as to be driven in rotation by the inner edge of the said rotary rings to undergo twisting. These rotary rings, being staggered along a rectilinear path and distributed in two groups, which overlap so that in following the rectilinear path there is encountered alternately a ring of one group and a ring of the other group. These two groups can undergo relative displacement in a plane perpendicular to the rectilinear path. The rings of the two groups are urged against a single drive roller driving the said rings, and the relative displacement of thetwo groups is effected by pivoting around the ads of this single drive roller.

7 Claims, 7 Drawing Figures PATENTEDIAY 21 I974 3Q 81 1 Q 258 sum 1 OF 3 I 1 TWISTING DEVICES FOR" F'ILAMENTS, ESPECIALLY FOR TEXTILE FILAMENTS The invention relates to twisting devices for filaments (that is to say for fine threads), especially for textile filaments, comprising several rotary rings against which the filament must be applied so as to be driven in rotation by the inner edge on the said rotary rings to undergo twisting.

' Hitherto, and more particularly in the textile field, such devices comprise rotary rings staggered along a rectilinear path and distributed in two overlapping groups, so that by following the said rectilinear path there will be encountered alternately a ring of one group and a ring of another group.

Certain of these devices were arranged so that the two groups of rings could undergo relative displacement in a plane perpendicular or substantially perpendicular to the rectilinear path.

However, in these known devices, the rotary drive mechanism of the rotary rings of the two groups was complicated, cumbersome and poorly adapted to high rotary speeds.

Moreover, this drive mechanism prevented dismounting and remounting of the rings from preceding easily.

Lastly, the means to be put in operation to effect the relative displacements between the two groups of rings were complicated and inaccurate.

Under these conditions, the known devices had a considerable bulk which rendered impossible or at least very difficult their mounting on existing textile machines equipped with twisting devices with magnetic false twist spindles.

It is an object of the invention to overcome the above-mentioned drawbacks.

The twisting device according to the invention is characterised by the fact that the rings of the two groups are held urged against a single drive roller driving the said rings, and by the fact that the relative movement of the two groups is effected by pivoting around the axis of this single drive roller.

It will then be appreciated that the rotary drive'mechanism of the rotary rings of the two groups is extremely simple, since it comprises neither belt, nor pulley, is of small bulk, and well adapted to high rotary speeds.

Moreover, this mechanism does not comprise any element'which constitutes anobstacle or impedes dismounting and remounting of the rings.

. (heater or cooler) followed or preceded by the twisting device. it is advantageous to arrange the twisting device so that the rotary ring situated just after or just before the fixing device has its inner edge tangential to the axis of the setting device two groups of rotary rings are in their active position.

The invention also relates to textile filaments obtained by textile machines equipped with the abovedefined twisting devices.

In order that the invention may be more fully understood, several preferred embodiments thereof are described below, purely by way of illustrative but nonlimiting example, with reference to the accompanying drawings in which:

FIG. 1 is a diagrammatic view in perspective of a twisting device according to the invention and showing the inactive position of tis two groups of rotary rings;

FIG. 2 shows, under the same conditions, the twisting device shown in FIG. 1, but for the active position of its two groups of rotary rings;

FIG. 3 shows, by a more detailed side view, a particular embodiment of a twisting device according to the invention, the two groups of rotary rings of this device being shown in their inactive position.

FIG. 4 shows, under the same conditions, the twisting device shown in FIG. 7, the two groups of rotary rings of this device occupying this time their active position;

FIG. 5 is an end view of the embodiment shown in FIG. 3;

FIG. 6 is an end view of the embodiment of the twisting device shown in FIG. 4; and, lastly,

FIG. 7 is a partial diagrammatic cross-section on a large scale of one embodiment of a twisting device according to the invention.

In FIGS. 1 and 2, there is shown diagrammatically a twisting device interposed between a setting device 1 and a delivery device 2 of a machine for texturizing a filament 3.

This twisting device comprises several rotary rings, denoted by the reference numeral 4 modified by an index a or b as explained below.

These rotary rings are actuated by a rotary movement in the same. sense and at the same speed or at different speeds, and the filament 3 must be applied against the said rotary rings so as to be driven in rotation by their inner edge to undergo twisting.

These rotary rings are staggered along a rectilinear path which the filament 3 would follow in the absence of the abovesaid rings, that is to say a rectilinear path extending from the setting device 1 to the deliverydevice 2. The rotary ring adjacent to the setting device is arranged with its inner edge tangential to the axis of the setting device.

These rotary rings are distributed in two overlapping groups A and B, so that by following this rectilinear path there is encountered alternately a ring 4a of Group A and a ring 4b of group B.

These two groups A and B can undergo relative displacement, in.a plane perpendicular to the rectilinear path, to pass from an inactive position, in which the rotary rings 4a, 4b of the two groups A and B encircle with spacing from the rectilinear path of the filament 3 (FIG. 1), to an active position, in which the rotary rings 4a, 4b of the two groups A and B come intocontact with the filament 3 and oblige it to follow a sinuous path which the filament 3 is applied against the said rotary rings 4a, 4b so as to be driven in rotation by their inner'edge to undergo the desired twisting (FIG. 2).

Preferably, means are provided to adjust the amplitude of the relative displacement undergone by the two groups A and B, which has the effect of adjusting the value E of the overlap of the rings 4a of the group A with respect to rings 4b of the group B.

Thus the angle can be adjusted which determines the sinuous path of the filament 3 in the course of its progress in the rings 40, 4b, and the arc of contact 0' 1r/2 0 of the filament 3 on the rounded portion R of the inner edge of each ring 4a, 4b (FIG. 7).

It will be noted that it is advantageous to arrange the two groups A and B so that when these two groups are in an inactive position (FIG. 1) the rings 4a, 4b of these two groups A and B are coaxial.

From a mechanical point of view, it is simpler to provide one group of fixed rings, the group A, while the other group, the group B, is movable.

The rings 4a and 4b are held supported on a single drive roller 5 which is in engagement with a tangential belt 7 and which drives the said rings.

The relative displacement of the two groups A and B is effected by pivoting around the axis of this single drive roller 5.

As regards the number of rotary rings which such a device comprises, itis advantageous to provide, for the fixedgroup A, at least two rotary rings 40, and for the movable group B, at least one rotary ring 4b.

In the FIGS. 1 to 6, there is shown a device which comprises a fixed group A with two rotary rings 4a, and a mobile group B with a rotary ring 412.

ln any case, and whatever the number of rotary rings of the fixed groups A and movable groups B, it is advantageous to arrange the twisting device so that the fixed group A has a rotary ring 4a situated just after the setting device 1, and that this ring 4a has its inner edge at atangent to the axis of the setting device 1.

The embodiment of the invention illustrated more particularly in the FIGS. 3 to 6 shows a twisting device of which the rotary rings 4a, 4b are driven by a drive roller 5. This drive roller 5 is itself driven by the tangentialbelt 7 and it comprises drive discs 8 cooperating respectively with the two rings 4a of the fixed group A .and with the ring 4b of the mobile group B.

To this end, each of the abovesaid rings 4a, 412 comprises a groove 9 in which the corresponding drive disc 8-becomes positioned and depending on the diameters of the grooves 9 in the rings and the diameters of the drive discs 8, the rings may be driven with the same or with'different speeds. v Y

Each ring 4a, 4b is held against this drive disc 8 by means of two rollers 10 borne by a fixed support 110 when it relates to two rings 4a of the fixed group A, and by a mobile support 1111 when it relates to the ring 41) of the mobile group B.

,For each ring 4a. 411, at least one of the rollers 10 of each pair of is movably mounted on its support 11a or 11b. and biased against the respective ring by means of an elastic strip 14.

Furthermore. the removal and positioning of the rings 4a, 4b can hence be operated rapidly and easily, which is very important since these parts must be replaced frequently. As shown in FIGS. 5 and 6 each ring is supported at three circumferentially spaced points by a respective disc 8 and two rollers 10 engaging inthe groove 90f the ring so that by moving one of the rollers against the bias of the respective elastic strip 14 out of the groove, the ring may be removed from the support and replaced.

The mobile support 11b is mounted pivotably around the axis of the drive roller 5 and bears a manipulating member 12; the means provided for adjusting the amplitude of the relative displacement of the mobile group B with respect to the fixed group A can be constituted by an adjustable'stop mechanism 13 (FIGS. 5 and 6).

The rings 4a, 4b are made of material having a good coefficient of, friction with the filament.

The constituent material of these rings 4a, 4b can be slightly flexible, in which case the assembly formed, by

the driveroller 5 and the drive discs 8 will be rigid.

tion has a certain number of advantages, among which may be mentioned those summarized by the following points:

Possibility of adjusting the tension and the rotary drive of the filament,

Obtaining of texturized filaments of very high quality as a result of the great regularity of twist under relatively slight tensions (less than 20g for a filament of 20 deniers), f

Ease of threading of the filament,

Possibility of starting the filament before bringing the twisting device into operation,

Simple and inexpensive manufacture of the twisting device, v

Possibility of installing twisting devices according to the invention in existing texturizing machines.

I claim:

l. A twisting device for filaments,-especially textile filaments, comprising a plurality of spaced superimposed rotary rings through which said filament is adapted to extend in engagement with the inner edge of each ring to undergo twisting during rotation of said rings, said superimposed rings being arranged in two groups, the rings of one groupbeing interposed between the rings of the other group, the rings of each group being arranged on a common axis, and the axes of both groups being parallel; a single drive roller means; means for holding eachof said rings in direct engagement with said drive roller means so that said rings are rotated by said drive roller means about their axes; and means for displacing the two groups of rings relative to each other about the axis of said drive roller means in a direction substantially normal to the axis of the latter.

2. A twisting device as defined in claim 1, wherein said means for holding each of said rings in direct engagement with said drive roller means is pivotable about the axis of the latter, and wherein said means for displacing the two groups of rings relative to each other about the axis of said drive roller means comprise means connected tosaid holding means of at least one of said groups for pivoting the respective holding means and therewith the rings held thereby about the axis of said drive roller means.

- 3. A twisting device as defined in claim 1, wherein one of the groups of rings is fixed and the other group of rings is displaceable. 1

4. A twisting device as defined in claim 3, wherein said one group comprises at least two rotary rings and the other group at least one rotary ring.

5. A twisting device as defined in claim 1, and including a setting device adjacent a ring on one end of said plurality of superimposed rings, said setting device having an axis arranged substantially tangential to the inner edge of the ring adjacent thereto in the active position of the group of rings.

6. A twisting device for filaments, especially textile filaments, comprising a plurality of spaced superimposed rotary rings through which said filament is adapted to extend in engagement with the inner edge of each ring to undergo twisting during rotatation of said rings, said superimposed rings being arranged in two groups, the rings of one group being interposed be tween the rings of the other group, the rings ofeach group being arranged on a common axis, the axes of both groups being parallel, and each of said rings being provided on its outer peripheral surface with a peripheral groove; drive roller means comprising a plurality of drive discs respectively engaged in the grooves of said rings; holding means for holding each disc in engagement in the groove of the respective ring, said holding means comprising a fixed support for each ring' of one of said groups, a mobile support for each ring of the other of said groups, a pair of rollers on each of said supports and engaged in the groove of the respective ring, and biasing'means biasing at least one of the rollers of each pair against the respective ring; and drive means for rotating said drive roller means about its axis.

7. A twisting device as defined in claim 6, wherein said drive means comprises a tangential belt in engagement with said drive roller means. 

1. A twisting device for filaments, especially textile filaments, comprising a plurality of spaced superimposed rotary rings through which said filament is adapted to extend in engagement with the inner edge of each ring to undergo twisting during rotation of said rings, said superimposed rings being arranged in two groups, the rings of one group being interposed between the rings of the other group, the rings of each group being arranged on a common axis, and the axes of both groups being parallel; a single drive roller means; means for holding each of said rings in direct engagement with said drive roller means so that said rings are rotated by said drive roller means about their axes; and means for displacing the two groups of rings relative to each other about the axis of said drive roller means in a direction substantially normal to the axis of the latter.
 2. A twisting device as defined in claim 1, wherein said means for holding each of said rings in direct engagement with said drive roller means is pivotable about the axis of the latter, and wherein said means for displacing the two groups of rings relative to each other about the axis of said drive roller means comprise means connected to said holding means of at least one of said groups for pivoting the respective holding means and therewith the rings held thereby about the axis of said drive roller means.
 3. A twisting device as defined in claim 1, wherein one of the groups of rings is fixed and the other group of rings is displaceable.
 4. A twisting device as defined in claim 3, wherein said one group comprises at least two rotary rings and the other group at least one rotary ring.
 5. A twisting device as defined in claim 1, and including a setting device adjacent a ring on one end of said plurality of superimposed rings, said setting device having an axis arranged substantially tangential to the inner edge of the ring adjacent thereto in the active position of the group of rings.
 6. A twisting device for filaments, especially textile filaments, comprising a plurality of spaced superimposed rotary rings through which said filament is adapted to extend in engagement with the inner edge of each ring to undergo twisting during rotatation of said rings, said superimposed rings being arranged in two groups, the rings of one group being interposed between the rings of the other group, the rings of each group being arranged on a common axis, the axes of both groups being parallel, and each of said rings being provided on its outer peripheral surface with a peripheral groove; drive roller means comprising a plurality of drive discs respectively engaged in the grooves of said rings; holding means for holding each disc in engagement in the groove of the respective ring, said holding means comprising a fixed support for each ring of one of said groups, a mobile support for each ring of the other of said groups, a pair of rollers on each of said supports and engaged in the groove of the respective ring, and biasing means biasing at least one of the rollers of each pair against the respective ring; and drive means for rotating said drive roller means about its axis.
 7. A twisting device as defined in claim 6, wherein said drive means comprises a tangential belt in engagement with said drive roller means. 